Geomunoreum (Korean: 거문오름; Hanja: 拒文岳; 巨文岳; 巨門岳), alternatively Geomeunoreum (검은오름), is an oreum (small extinct volcano) around Jocheon and Gujwa in Jeju City, Jeju Province, South Korea.

[1][2] The oreum is a popular tourist attraction, and has been a Natural Monument of South Korea No.

[3][2] In 2007, the Geomunoreum Lava Tube System around the oreum was made a UNESCO World Natural Heritage Site, as part of the item Jeju Volcanic Island and Lava Tubes.

[2] The oreum's name was later attested to as Geomunoreum or Geomunak (거문악; 拒文岳).

There are two main routes for tourists: Taegeuk (태극길) and Yongam (용암길).